This is Using MATLAB: I am trying to store the solution of this matrix because I...

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Advance Math

This is Using MATLAB:
I am trying to store the solution of this matrix because I wantto do something with the result like find the norm of that answerhowever I am stuck and cannot seem to be able to. Help would beappreciated!
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MATLAB CODE:
close all
clear
clc
A = [1 -1 2 -1;
2 -2 2 -3;
1 1 1 0;
1 -1 4 5];
b = [-8 -20 -2 4]';
x = gauss_elim(A,b)
function x = gauss_elim(A, b)
[nrow, ~] = size(A);
nb = length(b);
x = zeros(1,nrow);

% Gaussian elimination
for i = 1:nrow-1
if A(i,i) == 0
t = min(find(A(i+1:nrow,i) ~= 0) + i);
if isempty(t)
disp ('Error: A matrix is singular');
return
end
temp = A(i,:); tb = b(i);
A(i,:) = A(t,:); b(i) = b(t);
A(t,:) = temp; b(t) = tb;
end
for j = i+1:nrow
m = -A(j,i) / A(i,i);
A(j,i) = 0;
A(j,i+1:nrow) = A(j,i+1:nrow) + mA(i,i+1:nrow);
b(j) = b(j) + mb(i);
end
end

% Back substitution
x(nrow) = b(nrow) / A(nrow,nrow);
fprintf('Has exact solution:')
for i = nrow-1:-1:1
x(i) = (b(i) - sum(x(i+1:nrow) .* A(i,i+1:nrow))) / A(i,i);
end
end

Answer & Explanation Solved by verified expert

4.0 Ratings (745 Votes)

I think you want to say that for different system you will get different solutions but you dont want to lose the previous solution you want to store it you can simply write ax at the end your x vector See Answer

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